Macintosh PRAM battery alternative

What do you do if your PRAM battery is flat, and you haven’t got time to order a replacement?

Answer: get a packet of batteries from the £1 shop, and put a couple in your Mac as a temporary measure. Adjust a nut and bolt to make it a snug fit!  Note the polarity of this type of battery is the opposite to larger batteries. i.e. the positive terminal is the outside case.

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